ipv6: sr: add core files for SR HMAC support
This patch adds the necessary functions to compute and check the HMAC signature
of an SR-enabled packet. Two HMAC algorithms are supported: hmac(sha1) and
hmac(sha256).
In order to avoid dynamic memory allocation for each HMAC computation,
a per-cpu ring buffer is allocated for this purpose.
A new per-interface sysctl called seg6_require_hmac is added, allowing a
user-defined policy for processing HMAC-signed SR-enabled packets.
A value of -1 means that the HMAC field will always be ignored.
A value of 0 means that if an HMAC field is present, its validity will
be enforced (the packet is dropped is the signature is incorrect).
Finally, a value of 1 means that any SR-enabled packet that does not
contain an HMAC signature or whose signature is incorrect will be dropped.
Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/seg6.h b/include/net/seg6.h
index ff5da0c..4e03575 100644
--- a/include/net/seg6.h
+++ b/include/net/seg6.h
@@ -18,6 +18,7 @@
#include <linux/ipv6.h>
#include <net/lwtunnel.h>
#include <linux/seg6.h>
+#include <linux/rhashtable.h>
static inline void update_csum_diff4(struct sk_buff *skb, __be32 from,
__be32 to)
@@ -41,6 +42,9 @@ static inline void update_csum_diff16(struct sk_buff *skb, __be32 *from,
struct seg6_pernet_data {
struct mutex lock;
struct in6_addr __rcu *tun_src;
+#ifdef CONFIG_IPV6_SEG6_HMAC
+ struct rhashtable hmac_infos;
+#endif
};
static inline struct seg6_pernet_data *seg6_pernet(struct net *net)